EcuteK supports the retuning of the factory ECU in your, Nissan, Great Wall, Subaru, Toyota, Mitsubishi and Mazda.
Both Normally Aspirated, Turbo Petrol and Turbo Diesel.
To see more details and what can be done with a simple Pro Cable or a complete custom tune follow the links here.

I have received my installation CD and have installed DeltaDash on my PC. However, the program will not run when I click on the icon.

You must reboot after installing DeltaDash. The install program gives you this option, but you can of course cancel the reboot and do it later. If you do cancel, forget to reboot, and then try to run DeltaDash, this is the result. Just reboot now and it should then run fine.